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Persistent Medium & High alerts

Hello,

Running Windows XP SP3 and ZoneAlarm Extreme Security. Getting a lot of Firewall alerts most of them Medium and a few High. Sometimes the source DNS is a strange address. Some of the medium rated ones seem redundant and probably related to the cable modem I guess. Here is a screenshot of the alerts. Thanks for any help.

Generally speaking, some chinese servers and providers are frequently checking IP and ports globally over the internet (for their own interests).
In addition there is the usual internet background "noise" such as attempted VPN attempts, server connection attempts, pings,etc.
These are blocked by routers and hardware firewalls, hence these blocked incoming do not usually appear in the home or small office's software firewall logs. However, your IP indicates the ZA is the sole firewall, and in your case it would be normal to see these unwanted connection attempts.

In addition, if you have recently received a newer internet IP from your provider, you may be actually seeing traffic attempts from the previous owner of your new IP.